<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .div1{
            border-radius: 50% 50% 0 0/100% 100% 0 0;
            background-color: red;
            width:400px ;
            height: 200px;
        }
        .div2{
            border-radius: 50% 0 0 0/100% 100% 0 0;
            background-color: red;
            width:400px ;
            height: 200px;
        }
        .div3{
            border-radius: 50% 0 50% 0;
            background-color: red;
            width:400px ;
            height: 200px;
        }

    </style>
</head>
<body>
    <div class="div1"></div>
    <div class="div2"></div>
    <div class="div3"></div>
</body>
</html>